Guinea pigs have continuously growing teeth that require appropriate diet to wear correctly. Dental problems are among the most common and painful conditions in pet guinea pigs, yet many are preventable with proper husbandry.
Guinea pig dental health is a welfare concern that is frequently invisible to owners until it becomes severe. Unlike the visible incisors, guinea pig molars — which are responsible for most dental disease — cannot be examined without specialist equipment and often general anesthesia. This means that slowly progressive malocclusion and overgrowth go undetected until the guinea pig is losing significant weight and unable to eat normally, at which point the welfare burden has been severe for weeks or months. Prevention centers on diet: unlimited access to meadow hay provides the fiber density and texture required for appropriate dental wear while also supporting gut motility. Pellets and vegetables, while providing nutritional variety, cannot substitute for hay in dental wear function. Owners who provide primarily pellet-based diets because guinea pigs prefer them are inadvertently creating conditions for dental disease. Regular veterinary checks by a guinea pig-experienced practitioner, including assessment of body weight and incisor alignment, provide early detection opportunities before dental disease becomes welfare-critical.